New class of the Ti-Si-X system alloys , where X- Al, Ga, Sn, Zr, B is elaborated. Ti-“cast irons” with silicon content of 4-6-wt. % are the in situ composites in which the intermetallic strengthening phases (silicides, silico-borides) are produced during eutectic crystallization. Structure and physical and mechanical properties of a number of Ti–Si–Zr, Ti–Si–B, Ti-Si-Al, Ti–Si–Ga eutectic alloys are studied. It is shown that eutectic Ti–Si–Zr alloys reinforced by dispersed (Ti,Zr)2Si silicides in contrast to alloys based on Ti5Si3 silicides have improved mechanical properties. For the first time the as-cast Ti–Si–Zr–Sn eutectic alloy with RT plasticity of ~2 % was produced. Formation of the super dispersed eutectics based on the ternary Ti6Si2B compound in Ti–Si–B alloys allows to obtain titanium composites with enhanced high- temperature properties and an elasticity modulus of 150÷165 GPa. It may be perspective to develop novel high temperature titanium materials with enhanced rigidity. Study of aluminum, gallium and silicon joint effect in Ti–Si–Al and Ti-Si-Ga alloys showed the possibility to produce high-temperature strength titanium materials based on (a-Ti), (a2-Ti3Al), (a2-Ti3Ga) + Ti5(Si)3 binary eutectics.

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